OPA2353EA/2K5

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OPA2353EA/2K5 Application Field and Working Principle

The OPA2353EA/2K5 is a low power operational amplifier designed for instrumentation, linear, and buffer amplification applications. It features low input offset voltage, low supply current, low bias current, and low distortion. This amplifier is ideal for applications like digital isolators and signal conditioning, or for buffering low impedance signals.

The OPA2353EA/2K5 is a bipolar-input, low-power operational amplifier. It is a single-supply device and operates from 2.7 to 36 V DC. It typically draws about 500 μA of supply current and can supply output currents up to 15 mA with a max voltage swing of ± 5 V. It has a bandwidth of 5 MHz minimum from 0V to ± 5 V output swing and its slew rate is 0.1 V/us minimum.

The OPA2353EA/2K5 features low input offset voltage (3 mV maximum) and low supply current (typically 500 μA). It also has a low input bias current (20 pA) and low distortion (0.1 % maximum), making it a good choice for applications with low noise and high precision requirements. The device also features a high common-mode rejection (85 dB minimum) and low noise (7 nV/√Hz).

Working Principle

The OPA2353EA/2K5 is an operational amplifier with a differential input and a single-ended output. The input signal is amplified with a gain defined by the ratio of the input differential resistors (R1 and R2). The output is amplified by the gain of the amplifier and is then driven to the output. The amplifier is a commonly used type in which the two inputs of the differential buffer are active and the common-mode input voltage is kept constant. The output voltage is determined by the difference in the two inputs.

The OPA2353EA/2K5 uses a voltage feedback concept to achieve the right gain. The gain is defined by the ratio of the resistors R1 and R2. When the device receives a positive input voltage, the non-inverting input is greater than the inverting input voltage, the output will cause the signal to increase. When the input voltage is negative, the inverting input voltage is greater than the non-inverting input voltage and the output will cause the signal to decrease. The signal is limited by the voltage swing seen after the gain is applied.

The OPA2353EA/2K5 is also equipped with a protection circuit to prevent over-temperature damage. This protection circuit monitors the die temperature and limits the gain when temperatures exceed the maximum rating. This limits the potential for damage due to an overly hot environment.

Conclusion

The OPA2353EA/2K5 is a low-power operational amplifier ideal for instrumentation, linear, and buffer amplification applications. It features low input offset voltage, low supply current, low bias current, and low distortion. The device also has a high common-mode rejection and low noise. It is protected against over-temperature damage. With its impressive performance and features, the OPA2353EA/2K5 is a great choice for signal conditioning and buffering low impedance signals.

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